Solve the problem.A projectile is thrown upward so that its distance above the ground after t seconds is 
. After how many seconds does it reach its maximum height?
A. 15 s
B. 7 s
C. 30 s
D. 22.5 s
Answer: A
Mathematics
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Find the rate of change of y with respect to x at the given values of x and y.
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Choose the most reasonable metric length unit. Choose from km, m, cm, and mm.The distance from my town to the next town is 9 
.
A. km
B. cm
C.
| mm |
D. m
Mathematics
Simplify the expression and write the answer without negative exponents.(x-5y4)-2
A. 
B. 
C. 
D. 
Mathematics
Determine whether the equation defines y as a function of x. x2 + 2y2 = 1
A. function B. not a function
Mathematics